DOI: 10.1016/j.foreco.2015.03.044
Scopus记录号: 2-s2.0-84928014295
论文题名: Have changing forests conditions contributed to pollinator decline in the southeastern United States?
作者: Hanula J.L. ; Horn S. ; O'Brien J.J.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2015
卷: 348 起始页码: 142
结束页码: 152
语种: 英语
英文关键词: Apoidea
; Forest cover
; Forest health
; Native bees
; Pollinator decline
; Solitary bees
Scopus关键词: Conservation
; Ecosystems
; Hardwoods
; Plants (botany)
; Reforestation
; Apoidea
; Forest cover
; Forest health
; Native bees
; Pollinator decline
; Solitary bees
; Forestry
; bee
; ecological modeling
; forest ecosystem
; growing season
; habitat conservation
; habitat management
; habitat restoration
; native species
; plant community
; pollinator
; population density
; reforestation
; riparian vegetation
; stand structure
; understory
; vegetation cover
; wildfire
; Forests
; Insects
; Pinus
; Plants
; Restoration
; Thinning
; United States
; Apoidea
; Dendroctonus frontalis
; Sirex noctilio
英文摘要: Two conservation goals of the early 20th century, extensive reforestation and reduced wildfire through fire exclusion, may have contributed to declining pollinator abundance as forests became denser and shrub covered. To examine how forest structure affects bees we selected 5 stands in each of 7 forest types including: cleared forest; dense young pines; thinned young pines; mature open pine with extensive shrub/sapling cover; mature open pine with extensive herbaceous plant cover and little shrub cover; mature upland hardwood forest; and mature riparian hardwood forest. We sampled bees during the 2008 growing season using pan traps and measured overstory tree density, understory herbaceous plant and shrub diversity and cover, light penetration, and leaf area index. Numbers of bees and numbers of species per plot were highest in cleared forest and in mature pine stands with an herbaceous plant understory. Estimates of asymptotic species richness were highest in mature riparian hardwood forests, cleared forests and open pine forests with an herbaceous plant understory. Bee communities in the cleared forests and in the mature pine with an herbaceous plant understory were grouped together in ordination space which was consistent with perMANOVA results. The best predictor variable for bee species density was total tree basal area which was negatively correlated (r2=0.58), while the best model for predicting bee abundance (r2=0.62) included canopy openness, plant species density (both positively correlated) and shrub cover (negatively correlated). Our results combined with many others show that thinning forests combined with shrub control provides good bee habitat, is compatible with habitat restoration and management for other species, and the resulting forests will be healthier and less susceptible to old (e.g., southern pine beetle, Dendroctonus frontalis) and new (European woodwasp, Sirex noctilio) threats. © 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65432
Appears in Collections: 影响、适应和脆弱性
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作者单位: USDA Forest Service, Southern Research Station, 320 Green Street, Athens, GA, United States
Recommended Citation:
Hanula J.L.,Horn S.,O'Brien J.J.. Have changing forests conditions contributed to pollinator decline in the southeastern United States?[J]. Forest Ecology and Management,2015-01-01,348